Jfq model



PATENI'ED FEB. 16, 1904.

E. NIG-KERSON. FORM FOR MAKING HOLES 0R GONDUITS IN CONCRETE OR OTHER STRUCTURES. APPLIOATIOH FILED 001217, 1903.

N6 MODEL.

Z SHEETS-SHEET 1' WITIFIEEEE 5 M "law J.

v 'PATENTED FEB. 16, 1904.

- E. NIGKERSON. FORM FOR MAKING HOLES 0R connurrsm GONGRBTE OR OTHER STRUCTURES, I APPLIUATIOR "mm 00117, 1903.

2 SHEETS-SHEET 2.

N0 MODEL.

WITH E5 5 E '5 M in .z

NITED STATES Patented February 16, 1904.

ATENT Erica,

FORM FOR MAKING HOLES 0R CONDUITS lN C(idClil-ITE OR OTHER STRUCTURES.

SPECIFICATION forming part of Letters Patent No. 752,249, dated February 16, 1904. Application filed October 17, 1903. Serial Ho. 177,440 No model.)

To (all whomit may concern:

Be it known that I, Ennns'r Nrcnnnsos, a. citizen of the United States, and a resident of Newton, in the count; of haliddlesex and State of Massachusetts, have invented anew and useful Improvement in Forms for lilaking Holes or (,onduits in Concrete or other Structures. of which the following is afull, clear. andexact description, reference being had to the accompanying drawings, forminga part of this specification, in explaining its nature.

My invention relates to a form to be used in i'naking holes or conduits in concrete and other structures. it is embodied in a constructiim which can best be seen and understood by refcrence to the drawings forming a part of this specification, wherein-- Figure 1 shows the improved form in vertical longitudinal section taken through its center. Fig. 2 shows the same in longitudinal horizontal section. Fig. 3 shows a crosssection on the line 3 3 of Fig. 1, and Fig. 4 shows a cross-section on the line 4: 4 of Fig. l.

I will first refer to the improved form as complete, describing its various parts or ele ments of structure, and then refer more specifically to the form with respect to the peculiar efiiciency of construction, especial ly regards the facility with which its various parts or cle- Incnts may he put together preparatory to the work being done and after the work has been done the facility with which the form can he i knocked down and withdrawn from the hole i or conduit formed in the concreteor other sub- 5 stance.

In the drawings the outside of the formconsists of strips of lagging or sheathing A.

The various sections are arranged cylindri cally and laid to prop-ct 1n the direction in which it is desired to'make or extend the opening.

In this connection it is to be noted that although the form is shown as embodied in a cylindrical arrangement of the sheaves or lagging de signed to make rounded hole, yet this arrangement is but arbitrary, representing its more common embodiment, which'may well be changed, dependent upon the shape of the hole or conduit desired to be formed. ()ne of sections are cut to lit this wedge-shaped strip when introduced. This is to "facilitate the removal o'l the lagging after the hole or conduit has been formed by the withdrawal of the wedge-shaped strip, but to this reference will hereinafter be made.

The respective sheaves or strips of lagging are held in place by means of inside pieces B. These are made of relatively narrow pieces of wood and have segmental shape in order that their rounding edgles may give hearing or support to the lagging or sheathing on the inside, for, as stated before, my improved form is cmbodicd' in a cylindrical disposition of the sheaves or lagging aiilaptcd to make a round ing hole, although of course the sheaves or lagging might well have. some other arrangement, when the inside pieces B will be shaped to conform thereto. Referring, ho vever, to the pieces B as segmental pieces, it will be noted that those pieces are arranged with their straight edges parallelly disposed and somewhat separated from one another when the segmental pieces are in place. Two or more sets of these segmental pieces are required, and they will be spaced at such distances that the'lagging will be supported suflicicntly to 'n'evcnt its bending under tho-weight ot' the concrete or other material built around it.

interposed within the space left between the separated edges oi the respective sets of segmental pieces and placed to bear against and so to support the adjacent sheathing are side pieces B, which are held in place against limgitndinal movement by flanges I), secured to the adjoining pm'tions oi the segmental pieces B. which flanges act as stops upon either side to hold the side pieces in place against longitudinalmovement, as before described, but permitting oi their being drawn in laterally. and it is especially to be noted that the retention of the flanges l) is such that after the sidc pieces have been moved in laterally a certain amount they will be drawn clear of the flanges and may then he moved longitudinally or lengthwise the hole. Between these respective side pieces and resting upon the lower segmental pieces are placed a series the strips of lagging a isshaped like a wedge, of members comprising a central wedgeand the edges of its two adjoining strips or shaped member C and two side members- C 10 (1, having inclined sides which lie contiguous with the inclined sides of the wedge-shaped member interposed between them. These "side members bear aloug their outer sides bers C for practically when combined with the flangcs'l they serve as a means of. retention'to the side members (1 C for holding the same in place .against else than a lateral movement except when said side pieces are moved laterally to a certain position, when said side members are capable of longitudinal movement. 1 much prefer, however, to form the side pieces as separate parts, as before described.

The members C C (l are best made of wood and preferably bear such relation to each other along their inclined or sloping sides that when the central wedge-shaped member Q is half withdrawn in a direction parallel with the axis of the hole from between-the side members Q C then the lateral distance traveled by the side of the wedge-shaped member will be equal to the lateral distance traversed by the sidepieces B before they become -drawn clear of the flanges 7), which normally hold them against longitudinal movement, as

before described; but the central wedgeshapcd member C is so secured to its side members. C C that they are held in place against longitudinal movement by their connectionwith. the side pieces B, retained by their respective flanges, and will be drawn in laterally as the. central member C is drawn out or until the side pieces B have cleared the flanges which hold them, which happens when the central wedge-shaped member is about half withdrawn, for, as stated before, the radial distance traveled by the side of said member will-be equal to'the space traversed by the side pieces B before they are drawn clear of the flanges which hold them. The central wedge-shaped member C is accordingly fitted with top and bottom plates 0, which plates'extend out laterally from along its inclined sides with the ends of the respective plates turned in to lie in an alinement .parallel with the inclined side edges of said central member C and its adjacent side members. These turned edges ofthe plates c extend'into grooves-c, formed in the respective"side-members,the mechanical effect being that when the central wedge-shaped member C'is withdrawn it will draw the respective side members C C'- in laterally by'means of these connecting-plates, for, asbefore stated, the side members are held longitudinally fixed by being supported to the side pieces B, which are held by the flanges 7;, and this lateral indrawing of the side members and attached pieces is continued until the side pieces are drawn clear of the retaming-flanges I), when the side members, no longer being held fixed, will move longitudinally with the central member C and all -may be drawn out together.

The central wedge-shaped member 0 has a groove running longitudinally along its under side. This groove tits loosely over a pin c, which is driven into the top of the lower segmental piece B, and thus the member C is guided in its drawing movement with respect to the side members an equal amount on both sides. This construction of form is exceedingly simple and inexpensive. There, is no complexity of parts-nothing that can break or easily wear out. It is capable of repeated- Referring to the facility with which the form can be'used, 1 will first speak of the way in which it is built up preparatory to making a hole or conduit in concrete or other structure.

Supposing that it isdesired to form an opening through a wall of concrete, .when the grade of the top of the concrete approaches the grade of the bottom of the opening which in which it is desired to extend the opening;

otherwise the .free ends of the lagging or sheathing are supported in their correct position by any suitable profile. mental pieces B are then placed on edge within the placed lagging or sheathing, said segmental pieces being spaced from one another to properly support the sheathing, as before stated. The side pieces B are then slipped into their places between the retaining-flanges I) of the lower segmental pieces B and they are placed to bear against and to'so support that portion of the sheathing or lagging to which they are adjacent. The central wedge-shaped member 0 is then put in place, resting upon the lower segmental pieces B, and the two side members C C slid into place on either side thereof to beaiyflush up against the side pieces B. The side pieces are then nailed to said side membersthat is, if made in separateparts, as they preferably are. The upper segmental pieces B are then put in place, their flanges I) fitting down over the side pieces B and so suppljementing the flanges b upon the lower segmental pieces and holding said side pieces B over the upper segmental form and with the wedge-shaped piece a held'in place with a the side pieces B, to which the side members The under segin place- The remaining laggingis then built connecting-plates chas the effect of drawing in laterally the side members C ,1, as also.

the cement as it sets might have a tendency to contract and so bind the lagging or sheathing, but by means of the wedge-shaped piece of sheathing a this can be first pulled out, whereupon the remainingsections of sheathing or lagging collapse.

What I claim as my invention 1. A form of the character speeilicd, comprising strips'of lagging or sheathing, in ide pieces for supporting the same, said pieces m ans torcombining said mend a rs along their inclined edges permitting, however, of the central member having longitudinal movement relatively to its side members when they are held lixed.

l. A. form of the character specified, comprising strips of lagging or sheathing, inside pieces for supporting the same, members with inclined sides extending along and interposed between the separated edges of said inside pieces, means for holding said members in place against else than a lateral movement except when said members are moved laterally to a certain position, a wedge-shaped member interposed between and longitudinally extending with inclined sides contiguous with the inclined sides of said members aforesaid, and

interposed between the separated edges of tially as described.

said inside pieces, means of retention for holdmg said side pieces in place against else. than a lateral movement except when said side 1 pieces for supportlng the same, side members pieces are moved laterally to a certain position when they may be moved longitudinally, a wedge-shaped member and means for coml lining said wedge-shaped member with said side pieces that the same may be drawn in laterally by the inclined sides of the wedge-shaped member as said member is drawn out longitudinally, and when said side pieces are drawn in to a certain lateral position then they may be drawn out longitudinally with said wedgeshaped member.

:2. A form of the characterspecified. comprising strips oi lagging or sheathing, inside pieces for supporting the same, side members interposed to extend longitudinally between the separated edges of said inside pieces, means of retention for holding said side members in place against lse than a lateral movement except when said side members are moved laterally to a certain position when they may be moved longitudinally, a wedgeshaped member and means for combining said wedge-shaped member with said side members that the same may be drawn in laterally by the inclined sides of the wedge-shaped member said member is drawn out longitudinally, and when said side members are drawn in to a certain lateral position they may then be drawn out longitudinally with said wwlge shaped member.

3. A form of the character specil'icd, comprising strips of lagging or sheathing, inside pieces forsupporting the same, members with inclined sides extending longitudinally betwe n thesc 'iarated wlges of said inside pieces, meansot' holdingsaid members in place against else than a latrral movement except when said members have been moved in lab-rally to a certain position, a crntral nn-mbcr having in clined sides adapted to be placed between and with its inclined Ellits contiguous with the inclincd sides of lhe aforesaid members, and 1 plates with turned edges for combining said members along [lllll' inclined sides, substan- 5. A form of the character specified comprising strips of lagging or sheathing, inside interposed to extend longitudinally between the separated edges of'said inside pieces, means of retention for holding said side members in place against else than a lateral movement except when said side members are moved laterally to a certain position, when they may be moved longitudinally, a central wedge-shaped member having inclined sides adapted to be placed between and with its inclined side's contiguous with the sides of the aforesaid side members, means for combining said members along their inclined sides, permitting, however, of the central member having longitudinal movement relatively to its side members when they are held lixed, and means for guiding said central member that it may be drawn out upon the same line of longitudinal mow-- ment.

6. Ina form of the character specified, the combination of strips of lagging orsheathing, inside pieces B for supporting the same, a wedge-shaped member C interposed to extend longitudinally between the separated edges,

longitndinally-extending side members C, C;

means for holding said side members in place 'against else than a lateral movement except when said members have been moved in laterally to a certain position, and plates 1; for combining said members along their inclined edges, substantially as and for the purposes set forth.

7. In a form of the character specified, the combination of strips of lagging or sheathing, inside segmental pieces for supporting the same, side pieces B, flanges secured to said inside segmental pieces for holding said side pieces in place against'else than a lateral movement except when said members have been moved in laterally to a certain position, ries of members (I, (1', C, longitudimilly extending and interposed between said side pieccsto which saidmembersC,C aresccured, l greove formed in the central wedge-shaped means for combining said members along! member C, substantially and for the purt-heir inclined edgesfpermittlng, however, of poses set forth.

the central member 0 having longitudinal ERNEST NICKERSON. movement relatively to its side members when In presence ofr they are held fixed, and a pin secured to the (J. W. BATEMAN,

under segmental piece B adapted to run in a \V. S. MACDONALD. 

